disable checksum validation in download script
disable checksum validation in download script

- the sequence index turns out to be unreliable. The files on the
  1000Genomes site are sometimes smaller than what is listed in the
  sequence.index file
- The best solution is to find the correct read count and checksum for
  each file.
- For now we will assume that the fastqs are correct if no errors were
  encountered in the download.
- The number of reads in the fastq can be used for downstream QC

dpastling/cnv_pipeline,dpastling/plethora,dpastling/plethora,dpastling/plethora,dpastling/cnv_pipeline